After long sessions of Metaphor: ReFantazio, my AK620 ARGB seems to hit a thermal ceiling and drops my clock speeds. Do I need more exhaust?

After a four-hour marathon session, I noticed my boost clocks becoming unstable, with temps hovering around 82-87℃. The AK620's dual-tower setup is solid, but due to heat soak inside my case, the cooling efficiency dropped by about 15%. I tried cranking the fans to max, but it only dropped temps by 2℃ while making the PC sound like a vacuum cleaner, and the clocks still jumped between 4.2GHz and 4.5GHz. I eventually added a 120mm top exhaust fan to force the hot air out and switched the CPU cooling mode to 'Standard' in the BIOS. Real-time monitoring in HWInfo shows full-load temps have settled at 74-79℃, with clock variance under 0.1GHz. I actually struggled at first because I used a low-viscosity thermal paste that caused a 12℃ core delta; switching to a high-conductivity paste was the real game-changer. VRM temps are now 58-63℃. I've run several stress tests to verify the thermal state.